mineral
Tumbled hematite
Hematite (iron(III) oxide, Fe₂O₃)
AI-generated identification · may be incorrectTypically metallic to submetallic luster, steel-gray to reddish-brown color, opaque, and Mohs hardness 5–6.5; this rounded, polished form has no visible cleavage and a dense, heavy feel (specific gravity about 5.3).
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Physical properties
Typically metallic to submetallic luster, steel-gray to reddish-brown color, opaque, and Mohs hardness 5–6.5; this rounded, polished form has no visible cleavage and a dense, heavy feel (specific gravity about 5.3).
Formation & geological history
Forms through oxidation of iron-rich rocks, hydrothermal activity, sedimentary iron formation, or weathering; deposits range from Precambrian banded iron formations to younger supergene zones.
Uses & applications
Used as an iron ore, pigment, polishing abrasive, and ornamental tumbled stone; commonly marketed as “magnetic hematite,” though many such beads are actually synthetic ferrite.
Geological facts
Its diagnostic streak is cherry-red to reddish-brown, unlike the black streak of magnetite. Hematite is weakly magnetic or nonmagnetic, while synthetic magnetic hematite is strongly attracted to a magnet.
Field identification & locations
Common localities include Brazil, Australia, China, India, and the Lake Superior region of North America. Test an uncoated surface for a red streak and compare its unusually high density; polishing can obscure these clues.
